Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4e792b9a42b81c…

MALICIOUS

PDF

78.7 KB Created: 2021-09-08 19:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7f629cdb53e496505415fe3c9f7526ee SHA-1: e3d903a4a6de996dbd85444fc362623f6258c2e6 SHA-256: cc4e792b9a42b81cbebaa37a8def23cacca048135c505c1f666c1892e721cbe1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on potentially disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document's primary purpose is to redirect users to malicious sites. The ML classifier and ClamAV detection strongly support a malicious classification, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://equinox-e.com/upload/UserFiles/file/25192906838.pdf In PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/65147249345.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/limipisegexujopuzatew.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/3048250456.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/28042211571.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/97412983717.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/zebetajubeme.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/69742683537.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/zumisasasapubovarakaxali.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/vujuxolukejafos.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/98959972750.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/bomov.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210903_72758AD38E093124.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/86146562066.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/13796446083.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/25416152108.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/62859735834.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/nixekamevaxowewuxetok.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/naxuzazotakinamuxasete.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/82370627193.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/70557900045.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/hp1bmsghdt0ni1dcatgciulle1/63426453235.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/89227a79f1b84e36466f69b9a4ed9946/vizunorebiwuwezosexebut.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/30662610742.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/21108699804.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/62654123392.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/5862190486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=plantronics+blackwire+c3220+usb+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88D 18868 bytes
SHA-256: 800485c0737147c17458f57afeaec5a9263e2f824dccecec9e204b1921073de9
font_01_sfnt_off0000fa40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11257 11224 bytes
SHA-256: a8458d262cd1227d04c1df72a93197159f6de6c30e8a3aeae0b4d3d2adb93412